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+# @babel/plugin-transform-parameters
+
+> Compile ES2015 default and rest parameters to ES5
+
+This plugin transforms ES2015 parameters to ES5, this includes:
+
+- Destructuring parameters
+- Default parameters
+- Rest parameters
+
+## Examples
+
+**In**
+
+```javascript
+function test(x = "hello", { a, b }, ...args) {
+  console.log(x, a, b, args);
+}
+```
+
+**Out**
+
+```javascript
+function test() {
+  var x = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : "hello";
+  var _ref = arguments[1];
+  var a = _ref.a,
+      b = _ref.b;
+
+  for (var _len = arguments.length, args = Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {
+    args[_key - 2] = arguments[_key];
+  }
+
+  console.log(x, a, b, args);
+}
+```
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-transform-parameters
+```
+
+## Caveats
+
+Default parameters desugar into `let` declarations to retain proper semantics. If this is
+not supported in your environment then you'll need the
+[@babel/plugin-transform-block-scoping](http://babeljs.io/docs/plugins/transform-block-scoping) plugin.
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["@babel/plugin-transform-parameters"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins @babel/plugin-transform-parameters script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transform("code", {
+  plugins: ["@babel/plugin-transform-parameters"]
+});
+```
+
+## Options
+
+### `loose`
+
+`boolean`, defaults to `false`.
+
+In loose mode, parameters with default values will be counted into the arity of the function. This is not spec behavior where these parameters do not add to function arity.
+
+The `loose` implementation is a more performant solution as JavaScript engines will fully optimize a function that doesn't reference `arguments`. Please do your own benchmarking and determine if this option is the right fit for your application.
+
+```javascript
+// Spec behavior
+function bar1 (arg1 = 1) {}
+bar1.length // 0
+
+// Loose mode
+function bar1 (arg1 = 1) {}
+bar1.length // 1
+```